This paper clarifies that the external cavity modes deform optical output response in the DFB lasers by enhancing the relaxation oscillation under NRZ modulation. It is shown that a DFB laser with an asymmetric structure in reflectivity of facets and in position of a /spl lambda//4 phase shift can suppress the influence of the external cavity modes.>
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Kurosaki et al. (1994) studied this question.
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